2003 Ford F-450 Super Duty Ring and Pinion Set 4 X 2 - Dana 80 Rear - Thin Ring and Pinion Set - 3.73 Ratio - Fits 4 Series 4.10 & Up Carrier - Rear guaranteed to replace your current 2003 Ford F-450 Super Duty Ring and Pinion Set 4 X 2 - Dana 80 Rear - Thin Ring and Pinion Set - 3.73 Ratio - Fits 4 Series 4.10 & Up Carrier - Rear. 2003 Ford F-450 Super Duty Ring and Pinion Set comes new OEM 2003 Ford F-450 Super Duty Ring and Pinion Set aftermarket new 2003 Ford F-450 Super Duty Ring and Pinion Set of remanufactured 2003 Ford F-450 Super Duty Ring and Pinion Set 4 X 2 - Dana 80 Rear - Thin Ring and Pinion Set - 3.73 Ratio - Fits 4 Series 4.10 & Up Carrier - Rear.